• 支持通过 javaagent 参数设置需要 dump 的 calss 类前缀

使用方法如下

-javaagent:C:\EFaceGo\Tomcat8\webapps\manage\WEB-INF\lib\dumper.jar=com.hanvon;org.apache.tomcat.util.bcel.classfile.ClassParser;

这样只会dump jvm 里 com.hanvon 开头和 org.apache.tomcat.util.bcel.classfile.ClassParser 开头的class类，保存位置为 Java 的 temp 目录。

Extract the classes dynamically loaded in Java applications.

• Extracts classes loaded dynamically by a custom ClassLoader.
• Can be used to analyze obfuscated classes or classes protected by a packager.
• Offers an easy-to-use command-line interface.
• Generates output files in readable and processable formats (such as Java class files).
• Incorporates an anti-detection system, which involves modifying the sun/management/RuntimeImpl class at the ASM level to evade detection mechanisms.

1. Add -javaagent:dumper.jar=bypass to arguments. Where =bypass is optional.
   
   Note: I used =bypass argument, because the a_ class contains the next code:

static {
       List list = Arrays.asList("-javaagent", "-Xdebug", "-agentlib", "-Xrunjdwp", "-Xnoagent", "-verbose", "-DproxySet", "-DproxyHost", "-DproxyPort", "-Djavax.net.ssl.trustStore", "-Djavax.net.ssl.trustStorePassword", "-StartAttachListener", "-XBootclasspath");
       boolean bl = false;
       block0: for (String string : ManagementFactory.getRuntimeMXBean().getInputArguments()) {
           for (String string2 : list) {
               if (!string.startsWith(string2)) continue;
               bl = true;
               continue block0;
           }
       }
       block2: for (String string : Arrays.asList(System.getenv("JAVA_TOOL_OPTIONS"), System.getenv("JAVA_OPTIONS"), System.getenv("JAVA_OPTS"))) {
           if (string == null) continue;
           for (String string2 : list) {
               if (!string.contains(string2)) continue;
               bl = true;
               continue block2;
           }
       }
       if (bl) {
           Runtime.getRuntime().halt(1);
           Error error = new Error();
           error.setStackTrace(new StackTraceElement[0]);
           throw error;
       }
   }

2. After dumping, you will have a folder in your desktop with the classes.
   

3. You can convert the folder with classes into a .jar file using the Dumper as normal java application.